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// Portions Copyright [2019] Payara Foundation and/or affiliates

package com.sun.enterprise.admin.monitor.stats;

import org.glassfish.j2ee.statistics.Stats;
import org.glassfish.j2ee.statistics.CountStatistic;

/**
 * A Stats interface, to expose the monitoring information 
 * about the thread system of the JVM.
 * @since 8.1
 */
public interface JVMThreadStats extends Stats {
    
    /**
     * Returns the current number of live daemon and non-daemon 
     * threads
     * @return CountStatistic   current number of live threads
     */
    public CountStatistic getThreadCount();
    
    /**
     * Returns the peak live thread count, since the JVM started or
     * the peak was reset
     * @return CountStatistic   peak live thread count
     */
    public CountStatistic getPeakThreadCount();
    
    /**
     * Returns the total number of threads created and also started
     * since the JVM started
     * @return CountStatistic   total number of threads started
     */
    public CountStatistic getTotalStartedThreadCount();
    
    /**
     * Returns the current number of live daemon threads
     * @return CountStatistic   current number of live daemon threads
     */
    public CountStatistic getDaemonThreadCount();
    
    /**
     * Returns a comma separated list of all live thread ids
     * @return StringStatistic  live thread ids
     */
    public StringStatistic getAllThreadIds();
    
    /**
     * Returns the CPU time for the current thread in nanoseconds, if
     * CPU time measurement is enabled. Else returns -1
     * @return  CountStatistic  CPU time for the current thread
     */
    public CountStatistic getCurrentThreadCPUTime();
    
    /**
     * Returns a comma separated list of thread ids that are
     * monitor deadlocked
     * @return StringStatistic
     */
    public StringStatistic getMonitorDeadlockedThreads();
    
}
